The Cavalcade Of America. December 11, 1935 "The Will To Explore". Sponsored by: DuPont. Part one: "The Lewis and Clark Expedition." Part two: "Greeley Polar Expedition." Kenneth Webb (writer, director), Dwight Weist (announcer), Frank Singiser (commercial spokesman), Arthur Pryor (producer), Harold Levey (composer, conductor).oldtimeradiodvd.com/sale